with Welcome message of the bot we are getting and after some flow the fpb event is raised

with Welcome message of the bot we are getting and after some flow the fpb event is raised
Hi Naveeneee237 ,
Maybe they enter an answer of “unsure” to a question and this could trigger the BOT to transfer to a human.
In some instances, the bot may be unable to determine the intent of a customer's conversation. For example, the customer may be asking a specific question for which there is no topic, or there is no matching option within a topic.
In other instances, your customers may ask to be handed off to a live agent immediately. For example, customers may type "talk to agent" mid-way into a conversation.
You can refer following link:
Use hand-off to live agent - Power Virtual Agents | Microsoft Docs